Indian Society of Genetics & Plant Breeding


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CHROMOSOMAL rearrangements have been found to be adaptively established
in several natural populations of plant and animal species.
It is only in a few
cases, however, that the nature of the advantage associated with the observed
rearrangement has been understood (Darlington and La Cour, 1950; Rees, 1961;
Lewis and John, 1963). The present study was undertaken to investigate this
advantage for a rearrrangement reported recently from this laboratory in
Chrysanthemum carinatum. A number of varieties of this species have been found
to show an interchange in a majority of their plants (Rana and Jain, 1964).
It has also been found that varieties from India and from other parts of the world
carry the reciprocal translocation in two common pairs of chromosomes (Rana
and Jain, 1965). It could, thus, be concluded that one particular rearrangement has been favoured by natural selection under diverse. environmental
It was inferred that the interchange must confer a definite advantage
to have been so selected.


Year: 1967
Volume: 27
Issue: 1
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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